Instrument for defining arcs and irregular curves



NOV. 5, 1940. Q NELSON 2,220,422

INSTRUMENT FOR DEFINING ARCS AND IRREGULAR CURVES Filed Dec. 14, 1938flamr/m eziswmm ATTORNEYS Patented Nov. 5, 1940 I UNITED .QSTATES PATENTOFFlCE INSTRUMENT FOR DEFINING ARCS IRREGULAR CURVES Oscar H. Nelson,Peshtigo, Wis. Application December 14, 1938, Serial No. 245.722

2 Claims. (01. 33-176) My invention relates to improvements ininaccommodating therethrough the spaced arms I struments for definingarcs and irregular curves of the respective bars. Slidably mounted inthe and has as one of the principal objects thereof blocks I5, betweenthe arms I, are eye bolts H, the provision of an instrument of the abovedethe eyed ends of which have slidably mounted 5 scribed character whichis simple in constructherein adjusting rods l8 of a like constructiontion, durable in use, efficient in operation and as the rod I3. Theopposite ends of the bolts I1 economical in manufacture. have threadedthereon lock nuts I9 bearing Another object of my invention is toprovide a against the outer faces of the blocks I5 and servdevice of thecharacter described which may be ing to clamp the rods I8 against theopposite faces 10 readily adjustable to conform to the contour of a ofthe respective arms 1 whereby to maintain said 10 surface and utilizedin a manner whereby the rod in adjusted position relative to the bars.The contour may be delineated on another surface. lower ends of the rodsI3 and I! are provided Other objects and advantages will be apparentwith spherical heads 20 whereby to preclude withfrom the followingdescription, appended claims drawal of said rods from the respective eyebolts.

and annexed drawing. The opposite ends of the rods I3 and H are 15Referring to the drawing wherein like referthreadedly fixed withinhousings 2| and which ence characters designate like parts throughoutare provided with tongues 22 pivotally connected the several views:between the bifurcated ends of blocks 23 by Figure 1 is a side elevationof my invention, the means. of bolts 24. A block 23 is provided forparts thereof being arranged to define the coneach of the rods I3 and I!as clearly illustrated 20 tour of a concave surface. in Figure 1 of thedrawing and secured to said Figure 2 is a transverse sectional viewtakenon blocks is a resilient pliable strip25 by means of the line 22 ofFigure 1. screws 26.

Figure 3 is a horizontal detail sectional View The faces of the strip 25are provided with' 25 taken on the line 3-3 of Figure 1. scale markingsdenoting inches and fractions 25 Figure 4 is a detail sectional viewtaken on the thereof. The ends of the strip 25 have secured line 4-4 ofFigure 1. thereto semi-circular guides 21 on which are Figure 5 is adetail side elevation of one of the mounted arcuate shaped members 28fashioned end hooks partly in section. with slots receiving therethroughscrews threaded 30 Figure 6 is a bottom plan View of the end hook. intothe guides 21. The members 28 are adapted 30 v Figure 7 is a detail sideelevation of one of the to be adjusted over the ends of the strip 25 forends of the bars, partly in section, and depicting engagement with theends of adjacent surfaces the means for maintaining the arms of said barwhen desired. When not in use, the members 28 in spaced relation. areadjusted in the opposite direction to effect My novel form of instrumentcomprises a pair clearance with the ends of the strip. 35

of bars 5, the inner ends of which are pivotally In use, the rods I3 andI! are adjusted relaconnected by means of a hinge 6. Each of said tiveto the respective eye bolts to enable the strip bars is provided with apair of spaced arms I, to conform to the contour of a desired surface.the outer ends of which are connected together When thus adjusted, thelock nuts are tightened in spaced relation by means of a spacer 8secured to secure said rods in fixed position relative to 40therebetween by a bolt 8a. The inner ends of the bars thereby permittingthe contour defined said arms are connected to one of a pair of hinge ythe S p 25 to be delineated On er 1- leaves 9 of the hinge 6. face.

The hinge leaves 9 are fashioned with serrated y instrument isespecially adaptable n inabutting faces I0 and with registering openingsstances Where it is desirous of forming a ber 45 II through whichextends an eye bolt I2, The of like templets and also for use inconnection eyed end of the bolt l2 has slidably mounted with the hullsof ships and. the like in dev p therein an adjusting rod I3 and theopposite end the irre curve e o of said bolt has threaded thereon a locknut I4 It is also'obvious that the invention is not conwhereby to clampthe hinge leaves together and fined to the herein described use thereforas it secure the rod I3 in adjusted position against one may be utilizedfor any purpose to which it is of the outer faces of said leaves asclearly iladaptable. It is therefore to be distinctly underlustrated inFigure 2 of the drawing. stood that the invention is not limited to thespe- Slidably mounted on the bars 5 is a plurality cific construction asillustrated and described, as of spaced blocks I5 fashioned withrecesses I6 the same is only illustrative of the principles of operationwhich are capable of extended application in advance forms, and that theinvention comprehends all construction within the scope of the appendedclaims.

What is claimed is:

1. A device of the character described, comprising, hinged pairs ofspaced bars, blocks slidably mounted between the bars of each pair andprovided with sections overlying one face of the bars, an eye boltslidably extending through each block, rods slidably extending throughthe eyes of said bolts and slidably engaging the opposite face of saidbars, a flexible strip pivoted to the ends of said rods and adjustabletherewith with respect to said blocks to define a desired contour, andmeans operable on said bolts and engaging said sections to clamp saidrods and said blocks to said bars against relative movement to maintainsaid strip in a condition defining said contour.

2. A device of the character described, comprising, connected pairs ofspaced bars, blocks mounted on the bars of each pair and fashioned withspaced channels slidably accommodating said spaced bars, a memberslidably extending through each block, rods extending through saidmembers and slidably engaging the bars on the opposite sides thereofwith respect to the blocks, a flexible strip pivoted to the ends of therods and adjustable with the latter with respect to the bars to define adesired contour, and means mounted on said members and engaging saidblocks and operable against said blocks for clamping said rods and saidblocks to said bars against relative movement to maintain said strip ina desired configuration with respect to said bars.

OSCAR I-I. NELSON.

